Speaker



FIG. 1 is a front perspective view illustrating my design for a speaker;

FIG. 2 is a bottom view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a top view thereof.

The broken line showing on FIG. 2 is included for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 